Please check whether an unlock is needed before the return on line 891.
julia
---------- Forwarded message ----------
Date: Wed, 8 Nov 2017 15:05:33 +0800
From: kbuild test robot <fengguang.wu@xxxxxxxxx>
To: kbuild@xxxxxx
Cc: Julia Lawall <julia.lawall@xxxxxxx>
Subject: [target:for-next 17/33] drivers/target/target_core_user.c:891:2-8:
preceding lock on line 791
CC: kbuild-all@xxxxxx
CC: linux-rdma@xxxxxxxxxxxxxxx
CC: target-devel@xxxxxxxxxxxxxxx
CC: linux-scsi@xxxxxxxxxxxxxxx
CC: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending.git for-next
head: 3fc9fb13a4b2576aeab86c62fd64eb29ab68659c
commit: 0d44374c1aaec7c81b470d3b5f955bc270711f9c [17/33] tcmu: fix double se_cmd completion
:::::: branch date: 3 hours ago
:::::: commit date: 3 days ago
>> drivers/target/target_core_user.c:891:2-8: preceding lock on line 791
drivers/target/target_core_user.c:891:2-8: preceding lock on line 823
# https://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending.git/commit/?id=0d44374c1aaec7c81b470d3b5f955bc270711f9c
git remote add target https://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending.git
git remote update target
git checkout 0d44374c1aaec7c81b470d3b5f955bc270711f9c
vim +891 drivers/target/target_core_user.c
0d44374c Mike Christie 2017-10-25 757
02eb924f Andy Grover 2016-10-06 758 static sense_reason_t
02eb924f Andy Grover 2016-10-06 759 tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
7c9e7a6f Andy Grover 2014-10-01 760 {
7c9e7a6f Andy Grover 2014-10-01 761 struct tcmu_dev *udev = tcmu_cmd->tcmu_dev;
7c9e7a6f Andy Grover 2014-10-01 762 struct se_cmd *se_cmd = tcmu_cmd->se_cmd;
7c9e7a6f Andy Grover 2014-10-01 763 size_t base_command_size, command_size;
7c9e7a6f Andy Grover 2014-10-01 764 struct tcmu_mailbox *mb;
7c9e7a6f Andy Grover 2014-10-01 765 struct tcmu_cmd_entry *entry;
7c9e7a6f Andy Grover 2014-10-01 766 struct iovec *iov;
141685a3 Xiubo Li 2017-05-02 767 int iov_cnt, ret;
7c9e7a6f Andy Grover 2014-10-01 768 uint32_t cmd_head;
7c9e7a6f Andy Grover 2014-10-01 769 uint64_t cdb_off;
f97ec7db Ilias Tsitsimpis 2015-04-23 770 bool copy_to_data_area;
ab22d260 Xiubo Li 2017-03-27 771 size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd);
7c9e7a6f Andy Grover 2014-10-01 772
7c9e7a6f Andy Grover 2014-10-01 773 if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags))
02eb924f Andy Grover 2016-10-06 774 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
7c9e7a6f Andy Grover 2014-10-01 775
7c9e7a6f Andy Grover 2014-10-01 776 /*
7c9e7a6f Andy Grover 2014-10-01 777 * Must be a certain minimum size for response sense info, but
7c9e7a6f Andy Grover 2014-10-01 778 * also may be larger if the iov array is large.
7c9e7a6f Andy Grover 2014-10-01 779 *
fe25cc34 Xiubo Li 2017-05-02 780 * We prepare as many iovs as possbile for potential uses here,
fe25cc34 Xiubo Li 2017-05-02 781 * because it's expensive to tell how many regions are freed in
fe25cc34 Xiubo Li 2017-05-02 782 * the bitmap & global data pool, as the size calculated here
fe25cc34 Xiubo Li 2017-05-02 783 * will only be used to do the checks.
fe25cc34 Xiubo Li 2017-05-02 784 *
fe25cc34 Xiubo Li 2017-05-02 785 * The size will be recalculated later as actually needed to save
fe25cc34 Xiubo Li 2017-05-02 786 * cmd area memories.
7c9e7a6f Andy Grover 2014-10-01 787 */
fe25cc34 Xiubo Li 2017-05-02 788 base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt);
fe25cc34 Xiubo Li 2017-05-02 789 command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size);
7c9e7a6f Andy Grover 2014-10-01 790
b6df4b79 Xiubo Li 2017-05-02 @791 mutex_lock(&udev->cmdr_lock);
7c9e7a6f Andy Grover 2014-10-01 792
7c9e7a6f Andy Grover 2014-10-01 793 mb = udev->mb_addr;
7c9e7a6f Andy Grover 2014-10-01 794 cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */
554617b2 Andy Grover 2016-08-25 795 if ((command_size > (udev->cmdr_size / 2)) ||
554617b2 Andy Grover 2016-08-25 796 data_length > udev->data_size) {
554617b2 Andy Grover 2016-08-25 797 pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu "
3d9b9555 Andy Grover 2016-08-25 798 "cmd ring/data area\n", command_size, data_length,
7c9e7a6f Andy Grover 2014-10-01 799 udev->cmdr_size, udev->data_size);
b6df4b79 Xiubo Li 2017-05-02 800 mutex_unlock(&udev->cmdr_lock);
554617b2 Andy Grover 2016-08-25 801 return TCM_INVALID_CDB_FIELD;
554617b2 Andy Grover 2016-08-25 802 }
7c9e7a6f Andy Grover 2014-10-01 803
b6df4b79 Xiubo Li 2017-05-02 804 while (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) {
7c9e7a6f Andy Grover 2014-10-01 805 int ret;
7c9e7a6f Andy Grover 2014-10-01 806 DEFINE_WAIT(__wait);
7c9e7a6f Andy Grover 2014-10-01 807
7c9e7a6f Andy Grover 2014-10-01 808 prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE);
7c9e7a6f Andy Grover 2014-10-01 809
7c9e7a6f Andy Grover 2014-10-01 810 pr_debug("sleeping for ring space\n");
b6df4b79 Xiubo Li 2017-05-02 811 mutex_unlock(&udev->cmdr_lock);
af980e46 Mike Christie 2017-03-09 812 if (udev->cmd_time_out)
af980e46 Mike Christie 2017-03-09 813 ret = schedule_timeout(
af980e46 Mike Christie 2017-03-09 814 msecs_to_jiffies(udev->cmd_time_out));
af980e46 Mike Christie 2017-03-09 815 else
7c9e7a6f Andy Grover 2014-10-01 816 ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT));
7c9e7a6f Andy Grover 2014-10-01 817 finish_wait(&udev->wait_cmdr, &__wait);
7c9e7a6f Andy Grover 2014-10-01 818 if (!ret) {
7c9e7a6f Andy Grover 2014-10-01 819 pr_warn("tcmu: command timed out\n");
02eb924f Andy Grover 2016-10-06 820 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
7c9e7a6f Andy Grover 2014-10-01 821 }
7c9e7a6f Andy Grover 2014-10-01 822
b6df4b79 Xiubo Li 2017-05-02 823 mutex_lock(&udev->cmdr_lock);
7c9e7a6f Andy Grover 2014-10-01 824
7c9e7a6f Andy Grover 2014-10-01 825 /* We dropped cmdr_lock, cmd_head is stale */
7c9e7a6f Andy Grover 2014-10-01 826 cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */
7c9e7a6f Andy Grover 2014-10-01 827 }
7c9e7a6f Andy Grover 2014-10-01 828
f56574a2 Andy Grover 2014-10-02 829 /* Insert a PAD if end-of-ring space is too small */
f56574a2 Andy Grover 2014-10-02 830 if (head_to_end(cmd_head, udev->cmdr_size) < command_size) {
f56574a2 Andy Grover 2014-10-02 831 size_t pad_size = head_to_end(cmd_head, udev->cmdr_size);
f56574a2 Andy Grover 2014-10-02 832
7c9e7a6f Andy Grover 2014-10-01 833 entry = (void *) mb + CMDR_OFF + cmd_head;
0ad46af8 Andy Grover 2015-04-14 834 tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD);
0ad46af8 Andy Grover 2015-04-14 835 tcmu_hdr_set_len(&entry->hdr.len_op, pad_size);
0ad46af8 Andy Grover 2015-04-14 836 entry->hdr.cmd_id = 0; /* not used for PAD */
0ad46af8 Andy Grover 2015-04-14 837 entry->hdr.kflags = 0;
0ad46af8 Andy Grover 2015-04-14 838 entry->hdr.uflags = 0;
9d62bc0e Xiubo Li 2017-06-30 839 tcmu_flush_dcache_range(entry, sizeof(*entry));
7c9e7a6f Andy Grover 2014-10-01 840
7c9e7a6f Andy Grover 2014-10-01 841 UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size);
9d62bc0e Xiubo Li 2017-06-30 842 tcmu_flush_dcache_range(mb, sizeof(*mb));
7c9e7a6f Andy Grover 2014-10-01 843
7c9e7a6f Andy Grover 2014-10-01 844 cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */
7c9e7a6f Andy Grover 2014-10-01 845 WARN_ON(cmd_head != 0);
7c9e7a6f Andy Grover 2014-10-01 846 }
7c9e7a6f Andy Grover 2014-10-01 847
7c9e7a6f Andy Grover 2014-10-01 848 entry = (void *) mb + CMDR_OFF + cmd_head;
b3743c71 Xiubo Li 2017-07-11 849 memset(entry, 0, command_size);
0ad46af8 Andy Grover 2015-04-14 850 tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD);
7c9e7a6f Andy Grover 2014-10-01 851
3d9b9555 Andy Grover 2016-08-25 852 /* Handle allocating space from the data area */
b6df4b79 Xiubo Li 2017-05-02 853 tcmu_cmd_reset_dbi_cur(tcmu_cmd);
7c9e7a6f Andy Grover 2014-10-01 854 iov = &entry->req.iov[0];
f97ec7db Ilias Tsitsimpis 2015-04-23 855 iov_cnt = 0;
e4648b01 Ilias Tsitsimpis 2015-04-23 856 copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE
e4648b01 Ilias Tsitsimpis 2015-04-23 857 || se_cmd->se_cmd_flags & SCF_BIDI);
b6df4b79 Xiubo Li 2017-05-02 858 ret = scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg,
b6df4b79 Xiubo Li 2017-05-02 859 se_cmd->t_data_nents, &iov, &iov_cnt,
b6df4b79 Xiubo Li 2017-05-02 860 copy_to_data_area);
141685a3 Xiubo Li 2017-05-02 861 if (ret) {
b6df4b79 Xiubo Li 2017-05-02 862 tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
b6df4b79 Xiubo Li 2017-05-02 863 mutex_unlock(&udev->cmdr_lock);
b6df4b79 Xiubo Li 2017-05-02 864
141685a3 Xiubo Li 2017-05-02 865 pr_err("tcmu: alloc and scatter data failed\n");
141685a3 Xiubo Li 2017-05-02 866 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
141685a3 Xiubo Li 2017-05-02 867 }
7c9e7a6f Andy Grover 2014-10-01 868 entry->req.iov_cnt = iov_cnt;
7c9e7a6f Andy Grover 2014-10-01 869
e4648b01 Ilias Tsitsimpis 2015-04-23 870 /* Handle BIDI commands */
e4648b01 Ilias Tsitsimpis 2015-04-23 871 iov_cnt = 0;
b3743c71 Xiubo Li 2017-07-11 872 if (se_cmd->se_cmd_flags & SCF_BIDI) {
ab22d260 Xiubo Li 2017-03-27 873 iov++;
b6df4b79 Xiubo Li 2017-05-02 874 ret = scatter_data_area(udev, tcmu_cmd,
141685a3 Xiubo Li 2017-05-02 875 se_cmd->t_bidi_data_sg,
141685a3 Xiubo Li 2017-05-02 876 se_cmd->t_bidi_data_nents,
141685a3 Xiubo Li 2017-05-02 877 &iov, &iov_cnt, false);
141685a3 Xiubo Li 2017-05-02 878 if (ret) {
b6df4b79 Xiubo Li 2017-05-02 879 tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
b6df4b79 Xiubo Li 2017-05-02 880 mutex_unlock(&udev->cmdr_lock);
b6df4b79 Xiubo Li 2017-05-02 881
141685a3 Xiubo Li 2017-05-02 882 pr_err("tcmu: alloc and scatter bidi data failed\n");
141685a3 Xiubo Li 2017-05-02 883 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
141685a3 Xiubo Li 2017-05-02 884 }
ab22d260 Xiubo Li 2017-03-27 885 }
b3743c71 Xiubo Li 2017-07-11 886 entry->req.iov_bidi_cnt = iov_cnt;
26418649 Sheng Yang 2016-02-26 887
0d44374c Mike Christie 2017-10-25 888 ret = tcmu_setup_cmd_timer(tcmu_cmd);
0d44374c Mike Christie 2017-10-25 889 if (ret) {
0d44374c Mike Christie 2017-10-25 890 tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
0d44374c Mike Christie 2017-10-25 @891 return TCM_OUT_OF_RESOURCES;
0d44374c Mike Christie 2017-10-25 892 }
0d44374c Mike Christie 2017-10-25 893 entry->hdr.cmd_id = tcmu_cmd->cmd_id;
0d44374c Mike Christie 2017-10-25 894
fe25cc34 Xiubo Li 2017-05-02 895 /*
fe25cc34 Xiubo Li 2017-05-02 896 * Recalaulate the command's base size and size according
fe25cc34 Xiubo Li 2017-05-02 897 * to the actual needs
fe25cc34 Xiubo Li 2017-05-02 898 */
fe25cc34 Xiubo Li 2017-05-02 899 base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt +
fe25cc34 Xiubo Li 2017-05-02 900 entry->req.iov_bidi_cnt);
fe25cc34 Xiubo Li 2017-05-02 901 command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size);
fe25cc34 Xiubo Li 2017-05-02 902
fe25cc34 Xiubo Li 2017-05-02 903 tcmu_hdr_set_len(&entry->hdr.len_op, command_size);
fe25cc34 Xiubo Li 2017-05-02 904
7c9e7a6f Andy Grover 2014-10-01 905 /* All offsets relative to mb_addr, not start of entry! */
7c9e7a6f Andy Grover 2014-10-01 906 cdb_off = CMDR_OFF + cmd_head + base_command_size;
7c9e7a6f Andy Grover 2014-10-01 907 memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb));
7c9e7a6f Andy Grover 2014-10-01 908 entry->req.cdb_off = cdb_off;
7c9e7a6f Andy Grover 2014-10-01 909 tcmu_flush_dcache_range(entry, sizeof(*entry));
7c9e7a6f Andy Grover 2014-10-01 910
7c9e7a6f Andy Grover 2014-10-01 911 UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size);
7c9e7a6f Andy Grover 2014-10-01 912 tcmu_flush_dcache_range(mb, sizeof(*mb));
b6df4b79 Xiubo Li 2017-05-02 913 mutex_unlock(&udev->cmdr_lock);
7c9e7a6f Andy Grover 2014-10-01 914
7c9e7a6f Andy Grover 2014-10-01 915 /* TODO: only if FLUSH and FUA? */
7c9e7a6f Andy Grover 2014-10-01 916 uio_event_notify(&udev->uio_info);
7c9e7a6f Andy Grover 2014-10-01 917
af980e46 Mike Christie 2017-03-09 918 if (udev->cmd_time_out)
af980e46 Mike Christie 2017-03-09 919 mod_timer(&udev->timeout, round_jiffies_up(jiffies +
af980e46 Mike Christie 2017-03-09 920 msecs_to_jiffies(udev->cmd_time_out)));
7c9e7a6f Andy Grover 2014-10-01 921
02eb924f Andy Grover 2016-10-06 922 return TCM_NO_SENSE;
7c9e7a6f Andy Grover 2014-10-01 923 }
7c9e7a6f Andy Grover 2014-10-01 924
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